Hi Doctor, I m 23years old, I usually get my periods around 24-27th of every month regularly, but in november when i was going under my exams stress i got them on 15th, in december on 17th and now in january till today i.e 26th, I dint get my periods. What pills should I take to get them immediately, I cant delay them because next friday I m travelling. Please do give a quick reply.